Boil Down Meaning

(transitive) To reduce (to the most central elements or ingredients: to the essence, core, or implication for action).

Example:   He boiled the soup down so it wouldn't be so weak.
  So what this boils down to is that you still owe me that fifty bucks.
2013, Daniel Taylor, Andros Townsend calms England's nerves in taming of Montenegro (in The Guardian, 11 October 2013)[1]
  For England, everything now boils down to what happens against Poland on Tuesday.
  My dissertation is 342 pages long, and I'm required to boil it down to a one-page abstract?!